<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>Vectographical tests</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <h2>Vectographical tests</h2>
        <p>
            Image 1 shows vectographical test.
            It serves to examine border angle of stereoscopy.
            Test consists of external black circle and 4 triangles.
            Always one of the triangles - chosen at random by computer - is 3-dimensional.
            This triangle is shown as shifted in opposite direction for left and right eye,
            so it looks like located under or below surface of screen.
            There are 7 predefined angle of stereoscopy values: 0.5', 1', 2', 5', 10', 20', 50' (apostrofe means minutes of angle).
            Examiner can also choose any value of this angle. 
        </p>
    
        <p>
            During test patient points at this triangle which seems tree-dimensional using arrows on keyboard:
                <ul>
                    <li>Pressing &uarr; points upper triangle (12 o'clock).</li>
                    <li>Pressing &darr; points lower triangle (6 o'clock).</li>
                    <li>Pressing &larr; points left triangle (9 o'clock)</li>
                    <li>Pressing &rarr; points right triangle (3 o'clock)</li>
                </ul>
        </p>

        <p>
            For accurency improvement it's possible to automatically repeat test. Default amount of repetitions is 4.
        </p>

        <br><br><br>
        <center>
            <img src="../../images/testVectographical.png" />
            <br/>
            <i>Image 1. Vectographical test</i>
        </center>
  </body>
</html>